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5. Connection
After unscrewing the sensor cover, the control cable is inserted in the cable gland M16.
Supply voltage is to be connected to the terminals VCC and GND. The potential free change-
over contact is connected to the terminals NC, COM, NO.
Connection assignment / terminal block
REL NC Opening switch contact
REL NO Closing switch contact
REL CO Bockpol switch contact
AC/DC Operating voltage AC or 24 V DC +10%
AC/GND Operating voltage AC or 0 V
Jumper settings
1S3 Switch mode signal generator (dry)
2S2 Common contact to S3 and S1
3S1 Switch mode signal generator (wet)
4GND Signal generator ground
5BUZ Signal generator output
6T3 Switch mode relay (dry)
7T2 Common contact to T3 and T1
8T1 Switch mode relay (wet)
9HZ1 Heating
10 HZ2 Heating
Factory settings: S3 - S2, T1 - T2, HZ1 - HZ2
6. Signal generator output (optional)
A passive Piezo signal generator can be connected to the
connection terminals (pin BUZ and GND). The condition of
the signal (acoustic signal for dry or wet) can be selected
with the jumpers S1-S2 or S2-S3. In the default setting
S2-S3 the signal generator is inactive in case of rain.
7. Switching behaviour
The switching behaviour of the relay (energized or
de-energized in case of rain) can be selected by moving
the jumpers between T1-T2 or T2-T3. In the factory setting
the jumper T1-T2 is inserted and the relay is energized
when the sensor surface gets wet.
8. Heating
The sensor surface is heated when the jumper of HZ1-HZ2 is inserted. The heater should be
switched on to ensure faster drying or to enable operation at temperatures below freezing point.
In order to detect fog, the heater can be switched off.
9. Sensitivity setting
The sensitivity of the rain sensor can be adjusted via potentiometer. A higher sensitivity is
achieved by turning the potentiometer clockwise (left = high sensitivity, right = low sensitivity).
The middle position is most suitable for a normal rain signal.
Please note that no functions are affected to the end stops.
